Proportional gas and air mixer.



- F. K. BERRY. PROPORTIONM. GAS AND AIR MIXER.

' Patented N0' .9,1915Q APPLICATION F YILED JUNE'IZ. I915.

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UNITED STATES PATENT oFFIoE.

FRANKK. BERRY, OF BATTLE CREEK, MICHIGAN, ASSIGNOR. TO A.B STOVE COMPANY, OF BATTLE CREEK, MICHIGAN, A CORPORATION OF MICHIGAN.

PROPORTIONAL GAS AND AIR MIXER.

Specification of Letters Patent.

Patented Nov. 9, 1915.

Application filed June 12, 1915. Serial No. 33,819.

trolling gas and 'air in burners of the Bunsen type, being more particularly adapted for use upon gas ranges.

In the present state of the art in gas stove construction it is usual to mix the gas and air in a tube leading to the burner, the gas being injected centrally in the end of said tube, and the air being'controlled by a rotary register or damper. It is also usual to havethe burner and mixing tube freely-detachable from the valve so as to permit of cleaning.

It is the object of the present invention to obtain a construction of valve which controls both the gas and air supply, also the size of the orifice in the nozzle through which the gas is injected, the whole constituting a unit mountable upon the gas supply conduit independent of the detachable burner and mixing tube.

In the drawings: Figure 1 is a perspective view of the unit; Fig. 2 is a front ele' vationv-thereof showing a different position of adjustment Fig. 3 is a horizontal section showing the unit in connection with the mixing tube indicated in dotted lines; and Fig. tis a view similar to Fig. 3, showing a different adjustment of the valve and nozzle.

-For the proper combustion of it is necessary to maintain a standard proportion of gas and air without regard to the volume.

Itis equally important to etlect a thorough commingling ot the gas'aud air before com bustion takes place, and this is usually accomplished by a Bunsen burner. where a fine jet of gas is directed into a larger tube for uonnningling with the air. allected by the velocity of the gas jet. and this in turn is altered by adjustment of the valve. -Itis therefore difl'u-ult to maintain uniform conditions in quality oi the mixture with varying quantities. so that an adjust ment which is proper for a full head of gas The mixture is' will not be suitable where the burner is turned down. Vith my improved construction this defect is avoided by a simultaneous and corresponding adjustment of the gas valve, the air supply and the diameter all conditions the proper proportion of gas and air is maintained.

In detail, A is the casing of the gas valve, andB is the valve preferably of the tapering plug type.

C is the nozzle forming the delivery end of the casing A, and arranged to project into the mouth of the mixing tube 1), shown in dotted lines in Fig. 3. Mounted upon this nozzle C is a cap member E for engaging the bell-shaped mouth of the mixing tube,

said cap being apertured at F for the admission of air.

G is a rotary register slide or damper mounted upon the nozzle C adjacent to the cap E and adapted in different positions of adjustment to vary the open area of the apertures F.

H is a finger projecting from the-stem of the valve B, and slidably engaging a bearing on the damper G, preferably formed by a pair of ears I and I projecting therefrom. The end of the finger H has a spherical portion H fitting between said ears, and the latter are so fashioned that in the rocking movement of the valve a corresponding oscillation of the member G is ellected. "lhus, in the position of the valve in which the port J is wide open the finger ll will be in the position shown in Fig. '1. and the register (1 will be held in a position for fully opening theports F. ()n the other hand when the valve is turned toward its closed position, asindirated. in Fig. 4, the register (l will be rocked toward the position shown in Fig.

.l, .where the area oi the openings F is restricted. It is evident that by properly proportioning the parts the same ratio l)(-t\\'wll the volume of gas and air may be n'iaintained in all positions of :nljustment.

For delivering the full head olgaswlu'u the \al\'( I) is open, an a pcrture of predetermined area in the r-nd ol' the nozzle is ]l0(ZOSSfl1 V,ll1ll3 where the valve is nearly closed this aperturn will be'too great to maintain the proper velocity in the discharged stream of gas. I ltave therefore provided means for :n ljusting the area of the discharge nozzle, which is automatically operated by the movement of the orifice for the 'gas jet, 'sothat under of the valve. As shown, K is aconical bushing having a threaded engagement with the end of the nozzle and having an aperture K for the maximum discharge of gas.

L is a split tube within the nozzle having tapering resilient jaws L which fit within the conical bushing. The shank of this tube extends into contact with the valve plug, and the latter is provided with a cammed portion M which permits the restriction and opening of the jaws when the valve port is full open, and the forcing of the jaws outward into the conical bushing to close the same as the valve is turned toward its closest position. This produces the enlargement and contraction of the gas orifice corresponding to the port opening of the valve, thereby maintaining a substantially uniform velocity in the discharged stream of gas.

With the construction as described, when mounted upon a stove the mixing tube D of the burner will extend into en agement With the flange E of the cap mem er E without the necessity of any permanent attachment.

This permits of removing; the burner whenever it is necessary to clean the same, and

replacing without disturbing the valve or the cooperating parts operated thereby. What I claim as my invention is 1. The combination with a gas valve casing having a projecting nozzle, of a collapsible sleeve within said. nozzle for varying the discharge opening thereof, an air register. I

valve mounted upon said nozzle, a plug valve within said casing cammed to operate said collapsible sleeve'in the opening and closing of the valve, and a finger projecting from said plug valve operatively engaging said air register valve to effect a corresponding movement thereof.

2. Thecombination with the casing of a gas valve having a projecting discharge noz 3. The combination with a gas valve and its casing, the latter having a projecting nozzle, of a conical bushing engaged -within the end of the nozzle, and a collapsible sleeve within the nozzle, extending into said conical bushing, the valve having a cammed portion whereby the sleeve is longitudinally actuated by rotation of the'valve, varying the nozzle opening proportionately; to the variation in the gas valve, opening through the insertion of the nozzle in the conical bushing or its withdrawal therefrom.

In testimony whereof I affix my signature.

FRANK K. BERRY. 1

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

Washington, D. 0. 4 

